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6839a6d9 VV |
1 | /* |
2 | * NFIT - Machine Check Handler | |
3 | * | |
4 | * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of version 2 of the GNU General Public License as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | */ | |
15 | #include <linux/notifier.h> | |
16 | #include <linux/acpi.h> | |
17 | #include <asm/mce.h> | |
18 | #include "nfit.h" | |
19 | ||
20 | static int nfit_handle_mce(struct notifier_block *nb, unsigned long val, | |
21 | void *data) | |
22 | { | |
23 | struct mce *mce = (struct mce *)data; | |
24 | struct acpi_nfit_desc *acpi_desc; | |
25 | struct nfit_spa *nfit_spa; | |
26 | ||
27 | /* We only care about memory errors */ | |
28 | if (!(mce->status & MCACOD)) | |
29 | return NOTIFY_DONE; | |
30 | ||
31 | /* | |
32 | * mce->addr contains the physical addr accessed that caused the | |
33 | * machine check. We need to walk through the list of NFITs, and see | |
34 | * if any of them matches that address, and only then start a scrub. | |
35 | */ | |
36 | mutex_lock(&acpi_desc_lock); | |
37 | list_for_each_entry(acpi_desc, &acpi_descs, list) { | |
38 | struct device *dev = acpi_desc->dev; | |
39 | int found_match = 0; | |
40 | ||
41 | mutex_lock(&acpi_desc->init_mutex); | |
42 | list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { | |
43 | struct acpi_nfit_system_address *spa = nfit_spa->spa; | |
44 | ||
2e21807d | 45 | if (nfit_spa_type(spa) != NFIT_SPA_PM) |
6839a6d9 VV |
46 | continue; |
47 | /* find the spa that covers the mce addr */ | |
48 | if (spa->address > mce->addr) | |
49 | continue; | |
50 | if ((spa->address + spa->length - 1) < mce->addr) | |
51 | continue; | |
52 | found_match = 1; | |
53 | dev_dbg(dev, "%s: addr in SPA %d (0x%llx, 0x%llx)\n", | |
54 | __func__, spa->range_index, spa->address, | |
55 | spa->length); | |
56 | /* | |
57 | * We can break at the first match because we're going | |
58 | * to rescan all the SPA ranges. There shouldn't be any | |
59 | * aliasing anyway. | |
60 | */ | |
61 | break; | |
62 | } | |
63 | mutex_unlock(&acpi_desc->init_mutex); | |
64 | ||
65 | /* | |
66 | * We can ignore an -EBUSY here because if an ARS is already | |
67 | * in progress, just let that be the last authoritative one | |
68 | */ | |
69 | if (found_match) | |
70 | acpi_nfit_ars_rescan(acpi_desc); | |
71 | } | |
72 | ||
73 | mutex_unlock(&acpi_desc_lock); | |
74 | return NOTIFY_DONE; | |
75 | } | |
76 | ||
77 | static struct notifier_block nfit_mce_dec = { | |
78 | .notifier_call = nfit_handle_mce, | |
79 | }; | |
80 | ||
81 | void nfit_mce_register(void) | |
82 | { | |
83 | mce_register_decode_chain(&nfit_mce_dec); | |
84 | } | |
85 | ||
86 | void nfit_mce_unregister(void) | |
87 | { | |
88 | mce_unregister_decode_chain(&nfit_mce_dec); | |
89 | } |